Description

We seem to agree on marking the XO-4 internal SD media (aka mmc3 in linux, address d4217000) as non-removable at runtime.

The user would have to disassemble the system to get access to the motherboard, *and* remove the heatsink, all while the system is running.

Marking it as non-removable brings in an added bonus: as this slot has no card detection mechanism, Linux will no longer have to poll continuously to see if a card has been inserted - freeing up some system resources.